幕墙铝合金立柱抗风性能试验与分析

为研究单元体玻璃幕墙结构中开口截面铝合金立柱的抗风性能,进行了布置一组挂钩单元体和无挂钩单元体分别在正、负风作用下的试验研究,分析了铝合金立柱在不同风压作用下的平面内、平面外变形和应变,并进行了有限元分析。研究结果表明:合理布置挂钩的数量和位置时,横梁对立柱的约束作用有限;负风作用下,随着风压的增大,公、母立柱开口逐步减小并靠拢在一起,共同受力,协同变形,挂钩对立柱平面外稳定无影响;正风作用下,无挂钩立柱平面内变形远大于布置一组挂钩立柱平面内变形,挂钩对立柱的侧向扭转有良好的约束作用;有限元分析结果与试验实测结果吻合较好。

EXPERIMENT AND ANALYSIS ON WIND-RESISTANT PERFORMANCE OF ALUMINUM ALLOY COLUMNS IN CURTAIN WALL

To study the wind-resistant performance of the aluminum alloy columns with open section in curtain wall structures, the experiments of a unit curtain wall with a pair of hooks and without hooks were carried out under positive and negative pressure, respectively. The experimental results of displacement and strain under different wind pressure were analysed and the finite element analysis of them were also conducted. The test results show that: the transoms play a limited role when the quantities and displacement of the hooks are rational; when the negative pressure increases, the opening between male and female columns reduce gradually and close together at last, meanwhile the male and female columns have common stress and collaborative deformation and the hooks have no effect on the out-of-plane stability of the columns. The in-plane deformation of the columns without hooks is much greater than that of the columns with one pair of hooks with positive pressure of wind, meanwhile the hooks have a great effect on the lateral torsion of the columns. By comparing the results of experiments and FEA,it is shown that FEA results agree well with the experimental results.